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10 <br /> <br /> 2-year (cfs) 10-year (cfs) 100-year (cfs) <br />Existing Proposed Existing Proposed Existing Proposed <br />North to Private Ditch 3.5 2.3 5.1 3.9 6.9 5.7 <br />West to Private Ditch 11.6 9.2 34.1 28.7 82.8 74.7 <br />South through <br />Culvert under Birch <br />Street <br />4.4 3.5 8.0 6.5 14.6 11.9 <br />Totals* 19.2 12.5 46.7 35.6 103.3 87.8 <br />*Difference due to time of concentration <br /> <br />Post-development stormwater discharge rates are less than the pre-development rates. <br /> <br />Phasing <br /> <br />The site will be mass graded in one (1) phase and developed in two (2) phases. Phase 1 has 35 <br />lots and Phase 2 has 33 lots. <br /> <br />Utilities <br /> <br />Public water, sanitary and storm sewer utilities will be installed within the development. <br /> <br />Sanitary Sewer <br /> <br />An 8”-10” sanitary sewer pipe, 4” forcemain and lift station will serve the site. <br /> <br />Both existing houses located at 6651 and 6677 20th Avenue are served by private septic <br />systems. The house located at 6677 20th Avenue is being relocated onto a new lot in the <br />subdivision. Both houses are required to connect to the municipal sanitary sewer system. <br /> <br />Watermain <br /> <br />An 8” watermain will extend and loop from the east (NorthPointe) along Red Oak and from the <br />south (Birch Street) and serve the site. <br /> <br />The house located at 6651 20th Avenue is connected to municipal city water. The relocated <br />house will also connect to municipal city water. <br /> <br />Public Land Dedication <br /> <br />The City will require cash in lieu of land dedication. Per the City’s Park, Greenway & Trail <br />System Plan, a future neighborhood park is programmed to the west of this site. See <br />Attachment #3. Sidewalks along the streets in the development will connect to future trail <br />corridors along CSAH 34 (Birch Street) and CSAH 54 (20th Avenue). A 300 foot long trail will <br />be constructed in Outlot F and will terminate at the lot line. This trail segment will eventually <br />connect to a future trail along the north side of Birch Street. Terminating the trail at the lot line <br />now will prevent vehicles from confusing the trail with a road. Credit will be given for the <br />construction cost of the trail extension to Birch Street.